Initial e500v2 start up code

This is the first part of the start-up code. The source code origin is
U-boot and is slightly modified to have e500v2 CPU support in 32-bit
mode only.
It includes the power-up entry point, CPU initialization code and
exports definition for D-cache flush and I-cache invalidate.

Signed-off-by: Renaud Barbier <renaud.barbier@ge.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 1089 insertions, 0 deletions

diff --git a/arch/ppc/cpu-85xx/resetvec.S b/arch/ppc/cpu-85xx/resetvec.S
new file mode 100644
index 0000000000..29555d4a00
--- /dev/null
+++ b/arch/ppc/cpu-85xx/resetvec.S
@@ -0,0 +1,2 @@
+	.section .resetvec,"ax"
+	b _start_e500
diff --git a/arch/ppc/cpu-85xx/start.S b/arch/ppc/cpu-85xx/start.S
new file mode 100644
index 0000000000..fd9051b4fe
--- /dev/null
+++ b/arch/ppc/cpu-85xx/start.S
@@ -0,0 +1,1085 @@
+/*
+ * Copyright 2004, 2007-2011 Freescale Semiconductor, Inc.
+ * Copyright (C) 2003  Motorola,Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
+ *
+ * The processor starts at 0xfffffffc and the code is first executed in the
+ * last 4K page(0xfffff000-0xffffffff) in flash/rom.
+ */
+
+#include <config.h>
+#include <asm/config.h>
+
+#include <asm/processor.h>
+#include <asm/ppc_asm.tmpl>
+#include <asm/ppc_defs.h>
+#include <asm/cache.h>
+
+#include <mach/mpc85xx.h>
+#include <mach/mmu.h>
+
+#undef	MSR_KERNEL
+#define MSR_KERNEL ( MSR_ME )	/* Machine Check */
+
+/*
+ * Set up GOT: Global Offset Table
+ *
+ * Use r12 to access the GOT
+ */
+	START_GOT
+	GOT_ENTRY(_GOT2_TABLE_)
+	GOT_ENTRY(_FIXUP_TABLE_)
+
+	GOT_ENTRY(_start)
+	GOT_ENTRY(_start_of_vectors)
+	GOT_ENTRY(_end_of_vectors)
+	GOT_ENTRY(transfer_to_handler)
+	GOT_ENTRY(__init_end)
+	GOT_ENTRY(_end)
+	GOT_ENTRY(__bss_start)
+	END_GOT
+
+/*
+ * e500 Startup -- after reset only the last 4KB of the effective
+ * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
+ * section is located at THIS LAST page and basically does three
+ * things: clear some registers, set up exception tables and
+ * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
+ * continue the boot procedure.
+ * Once the boot rom is mapped by TLB entries we can proceed
+ * with normal startup.
+ */
+
+	.section .bootpg,"ax"
+	.globl _start_e500
+
+_start_e500:
+
+/* clear registers/arrays not reset by hardware */
+
+	/* L1 */
+	li	r0,2
+	mtspr	L1CSR0,r0	/* invalidate d-cache */
+	mtspr	L1CSR1,r0	/* invalidate i-cache */
+
+	mfspr	r1,DBSR
+	mtspr	DBSR,r1		/* Clear all valid bits */
+
+	/* Enable/invalidate the I-Cache */
+	lis	r2,(L1CSR1_ICFI|L1CSR1_ICLFR)@h
+	ori	r2,r2,(L1CSR1_ICFI|L1CSR1_ICLFR)@l
+	mtspr	SPRN_L1CSR1,r2
+1:
+	mfspr	r3,SPRN_L1CSR1
+	and.	r1,r3,r2
+	bne	1b
+
+	lis	r3,(L1CSR1_CPE|L1CSR1_ICE)@h
+	ori	r3,r3,(L1CSR1_CPE|L1CSR1_ICE)@l
+	mtspr	SPRN_L1CSR1,r3
+	isync
+2:
+	mfspr	r3,SPRN_L1CSR1
+	andi.	r1,r3,L1CSR1_ICE@l
+	beq	2b
+
+	/* Enable/invalidate the D-Cache */
+	lis	r2,(L1CSR0_DCFI|L1CSR0_DCLFR)@h
+	ori	r2,r2,(L1CSR0_DCFI|L1CSR0_DCLFR)@l
+	mtspr	SPRN_L1CSR0,r2
+1:
+	mfspr	r3,SPRN_L1CSR0
+	and.	r1,r3,r2
+	bne	1b
+
+	lis	r3,(L1CSR0_CPE|L1CSR0_DCE)@h
+	ori	r3,r3,(L1CSR0_CPE|L1CSR0_DCE)@l
+	mtspr	SPRN_L1CSR0,r3
+	isync
+2:
+	mfspr	r3,SPRN_L1CSR0
+	andi.	r1,r3,L1CSR0_DCE@l
+	beq	2b
+
+	/* Setup interrupt vectors */
+	lis	r1,TEXT_BASE@h
+	mtspr	IVPR,r1
+
+	li	r1,0x0100
+	mtspr	IVOR0,r1	/* 0: Critical input */
+	li	r1,0x0200
+	mtspr	IVOR1,r1	/* 1: Machine check */
+	li	r1,0x0300
+	mtspr	IVOR2,r1	/* 2: Data storage */
+	li	r1,0x0400
+	mtspr	IVOR3,r1	/* 3: Instruction storage */
+	li	r1,0x0500
+	mtspr	IVOR4,r1	/* 4: External interrupt */
+	li	r1,0x0600
+	mtspr	IVOR5,r1	/* 5: Alignment */
+	li	r1,0x0700
+	mtspr	IVOR6,r1	/* 6: Program check */
+	li	r1,0x0800
+	mtspr	IVOR7,r1	/* 7: floating point unavailable */
+	li	r1,0x0900
+	mtspr	IVOR8,r1	/* 8: System call */
+	/* 9: Auxiliary processor unavailable(unsupported) */
+	li	r1,0x0a00
+	mtspr	IVOR10,r1	/* 10: Decrementer */
+	li	r1,0x0b00
+	mtspr	IVOR11,r1	/* 11: Interval timer */
+	li	r1,0x0c00
+	mtspr	IVOR12,r1	/* 12: Watchdog timer */
+	li	r1,0x0d00
+	mtspr	IVOR13,r1	/* 13: Data TLB error */
+	li	r1,0x0e00
+	mtspr	IVOR14,r1	/* 14: Instruction TLB error */
+	li	r1,0x0f00
+	mtspr	IVOR15,r1	/* 15: Debug */
+
+	/* Clear and set up some registers. */
+	li      r0,0x0000
+	lis	r1,0xffff
+	mtspr	DEC,r0			/* prevent dec exceptions */
+	mttbl	r0			/* prevent fit & wdt exceptions */
+	mttbu	r0
+	mtspr	TSR,r1			/* clear all timer exception status */
+	mtspr	TCR,r0			/* disable all */
+	mtspr	ESR,r0			/* clear exception syndrome register */
+	mtspr	MCSR,r0			/* machine check syndrome register */
+	mtxer	r0			/* clear integer exception register */
+
+	/* Enable Time Base and Select Time Base Clock */
+	lis	r0,HID0_EMCP@h		/* Enable machine check */
+	ori	r0,r0,HID0_TBEN@l	/* Enable Timebase */
+	mtspr	HID0,r0
+
+	li	r0,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
+	mfspr	r3,PVR
+	andi.	r3,r3, 0xff
+	cmpwi	r3,0x50@l	/* if we are rev 5.0 or greater set MBDD */
+	blt 1f
+	/* Set MBDD bit also */
+	ori r0, r0, HID1_MBDD@l
+1:
+	mtspr	HID1,r0
+
+	/* Enable Branch Prediction */
+#if defined(CFG_BTB)
+	lis	r0,BUCSR_ENABLE@h
+	ori	r0,r0,BUCSR_ENABLE@l
+	mtspr	SPRN_BUCSR,r0
+#endif
+
+	lis     r6,FSL_BOOKE_MAS0(1, 15, 0)@h
+	ori     r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l
+
+	/* create a temp mapping in AS=1 to the 4M boot window */
+	lis     r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@h
+	ori     r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@l
+
+	lis     r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@h
+	ori     r8,r8,FSL_BOOKE_MAS2(TEXT_BASE & 0xffc00000, (MAS2_I|MAS2_G))@l
+
+	lis     r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
+	ori     r9,r9,FSL_BOOKE_MAS3(0xffc00000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l
+
+	mtspr   MAS0,r6
+	mtspr   MAS1,r7
+	mtspr   MAS2,r8
+	mtspr   MAS3,r9
+	isync
+	msync
+	tlbwe
+
+	/* create a temp mapping in AS=1 to the stack */
+	lis     r6,FSL_BOOKE_MAS0(1, 14, 0)@h
+	ori     r6,r6,FSL_BOOKE_MAS0(1, 14, 0)@l
+
+	lis     r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@h
+	ori     r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_16K)@l
+
+	lis     r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@h
+	ori     r8,r8,FSL_BOOKE_MAS2(CFG_INIT_RAM_ADDR, 0)@l
+
+	lis     r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0,
+                                  (MAS3_SX|MAS3_SW|MAS3_SR))@h
+	ori     r9,r9,FSL_BOOKE_MAS3(CFG_INIT_RAM_ADDR, 0,
+                                     (MAS3_SX|MAS3_SW|MAS3_SR))@l
+
+	mtspr   MAS0,r6
+	mtspr   MAS1,r7
+	mtspr   MAS2,r8
+	mtspr   MAS3,r9
+	isync
+	msync
+	tlbwe
+
+	lis	r6,MSR_IS|MSR_DS@h
+	ori	r6,r6,MSR_IS|MSR_DS@l
+	lis	r7,switch_as@h
+	ori	r7,r7,switch_as@l
+
+	mtspr	SPRN_SRR0,r7
+	mtspr	SPRN_SRR1,r6
+	rfi
+
+switch_as:
+/* L1 DCache is used for initial RAM */
+
+	/* Allocate initial RAM in data cache.  */
+	lis	r3,CFG_INIT_RAM_ADDR@h
+	ori	r3,r3,CFG_INIT_RAM_ADDR@l
+	mfspr	r2, L1CFG0
+	andi.	r2, r2, 0x1ff
+	/* cache size * 1024 / (2 * L1 line size) */
+	slwi	r2, r2, (10 - 1 - L1_CACHE_SHIFT)
+	mtctr	r2
+	li	r0,0
+1:
+	dcbz	r0,r3
+	dcbtls	0,r0,r3
+	addi	r3,r3,CACHELINE_SIZE
+	bdnz	1b
+
+	/*
+	 * Jump out the last 4K page and continue to 'normal' start.
+	 * Calculate absolute address in FLASH and jump there.
+	 */
+	lis	r3,TEXT_BASE@h
+	ori	r3,r3,TEXT_BASE@l
+	addi	r3,r3,_start_cont - _start + _START_OFFSET
+	mtlr	r3
+	blr
+
+	.text
+	.globl	_start
+_start:
+	.long	0x62626F78		/* Magic Number */
+
+	.align	4
+	.globl	_start_cont
+_start_cont:
+	/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache */
+	lis	r1,CFG_INIT_RAM_ADDR@h
+	ori	r1,r1,CFG_INIT_SP_OFFSET@l
+
+	li	r0,0
+	stwu	r0,-4(r1)
+	stwu	r0,-4(r1)		/* Terminate call chain */
+
+	stwu	r1,-8(r1)		/* Save back chain and move SP */
+	lis	r0,RESET_VECTOR@h	/* Address of reset vector */
+	ori	r0,r0,RESET_VECTOR@l
+	stwu	r1,-8(r1)		/* Save back chain and move SP */
+	stw	r0,+12(r1)		/* Save return addr (underflow vect) */
+
+	GET_GOT
+	bl	cpu_init_early_f
+
+	/* switch back to AS = 0 */
+	lis	r3,(MSR_CE|MSR_ME|MSR_DE)@h
+	ori	r3,r3,(MSR_CE|MSR_ME|MSR_DE)@l
+	mtmsr	r3
+	isync
+
+	bl      cpu_init_f
+	bl      initdram
+	b       relocate_code
+	isync
+
+	/* NOTREACHED - board_init_f() does not return */
+
+	. = EXC_OFF_SYS_RESET
+	.globl	_start_of_vectors
+_start_of_vectors:
+
+/* Critical input. */
+	CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)
+
+/* Machine check */
+	MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)
+
+/* Data Storage exception. */
+	STD_EXCEPTION(0x0300, DataStorage, UnknownException)
+
+/* Instruction Storage exception. */
+	STD_EXCEPTION(0x0400, InstStorage, UnknownException)
+
+/* Alignment exception. */
+	. = 0x0600
+Alignment:
+	EXCEPTION_PROLOG(SRR0, SRR1)
+	mfspr	r4,DAR
+	stw	r4,_DAR(r21)
+	mfspr	r5,DSISR
+	stw	r5,_DSISR(r21)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
+	EXC_XFER_TEMPLATE(Alignment, AlignmentException, MSR_KERNEL, COPY_EE)
+
+/* Program check exception */
+	. = 0x0700
+ProgramCheck:
+	EXCEPTION_PROLOG(SRR0, SRR1)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
+	EXC_XFER_TEMPLATE(ProgramCheck, ProgramCheckException,
+		MSR_KERNEL, COPY_EE)
+
+	/* No FPU on MPC85xx.  This exception is not supposed to happen.  */
+	STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)
+
+	. = 0x0900
+/*
+ * r0 - SYSCALL number
+ * r3-... arguments
+ */
+SystemCall:
+	addis	r11,r0,0	/* get functions table addr */
+	ori	r11,r11,0	/* Note: this code is patched in trap_init */
+	addis	r12,r0,0	/* get number of functions */
+	ori	r12,r12,0
+
+	cmplw	0,r0,r12
+	bge	1f
+
+	rlwinm	r0,r0,2,0,31	/* fn_addr = fn_tbl[r0] */
+	add	r11,r11,r0
+	lwz	r11,0(r11)
+
+	li	r20,0xd00-4	/* Get stack pointer */
+	lwz	r12,0(r20)
+	subi	r12,r12,12	/* Adjust stack pointer */
+	li	r0,0xc00+_end_back-SystemCall
+	cmplw	0,r0,r12	/* Check stack overflow */
+	bgt	1f
+	stw	r12,0(r20)
+
+	mflr	r0
+	stw	r0,0(r12)
+	mfspr	r0,SRR0
+	stw	r0,4(r12)
+	mfspr	r0,SRR1
+	stw	r0,8(r12)
+
+	li	r12,0xc00+_back-SystemCall
+	mtlr	r12
+	mtspr	SRR0,r11
+
+1:	SYNC
+	rfi
+_back:
+
+	mfmsr	r11		/* Disable interrupts */
+	li	r12,0
+	ori	r12,r12,MSR_EE
+	andc	r11,r11,r12
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r11
+	SYNC
+
+	li	r12,0xd00-4	/* restore regs */
+	lwz	r12,0(r12)
+
+	lwz	r11,0(r12)
+	mtlr	r11
+	lwz	r11,4(r12)
+	mtspr	SRR0,r11
+	lwz	r11,8(r12)
+	mtspr	SRR1,r11
+
+	addi	r12,r12,12	/* Adjust stack pointer */
+	li	r20,0xd00-4
+	stw	r12,0(r20)
+
+	SYNC
+	rfi
+_end_back:
+
+	STD_EXCEPTION(0x0a00, Decrementer, UnknownException)
+	STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
+	STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)
+
+	STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
+	STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)
+
+	CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )
+
+	.globl	_end_of_vectors
+_end_of_vectors:
+
+	. = . + (0x100 - ( . & 0xff ))	/* align for debug */
+
+/*
+ * This code finishes saving the registers to the exception frame
+ * and jumps to the appropriate handler for the exception.
+ * Register r21 is pointer into trap frame, r1 has new stack pointer.
+ */
+	.globl	transfer_to_handler
+transfer_to_handler:
+	stw	r22,_NIP(r21)
+	lis	r22,MSR_POW@h
+	andc	r23,r23,r22
+	stw	r23,_MSR(r21)
+	SAVE_GPR(7, r21)
+	SAVE_4GPRS(8, r21)
+	SAVE_8GPRS(12, r21)
+	SAVE_8GPRS(24, r21)
+
+	mflr	r23
+	andi.	r24,r23,0x3f00	/* get vector offset  */
+	stw	r24,TRAP(r21)
+	li	r22,0
+	stw	r22,RESULT(r21)
+	mtspr	SPRG2,r22	/* r1 is now kernel sp */
+
+	lwz	r24,0(r23)	/* virtual address of handler 	*/
+	lwz	r23,4(r23)	/* where to go when done 	*/
+	mtspr	SRR0,r24
+	mtspr	SRR1,r20
+	mtlr	r23
+	SYNC
+	rfi			/* jump to handler, enable MMU  */
+
+int_return:
+	mfmsr	r28		/* Disable interrupts */
+	li	r4,0
+	ori	r4,r4,MSR_EE
+	andc	r28,r28,r4
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r28
+	SYNC
+	lwz	r2,_CTR(r1)
+	lwz	r0,_LINK(r1)
+	mtctr	r2
+	mtlr	r0
+	lwz	r2,_XER(r1)
+	lwz	r0,_CCR(r1)
+	mtspr	XER,r2
+	mtcrf	0xFF,r0
+	REST_10GPRS(3, r1)
+	REST_10GPRS(13, r1)
+	REST_8GPRS(23, r1)
+	REST_GPR(31, r1)
+	lwz	r2,_NIP(r1)	/* Restore environment */
+	lwz	r0,_MSR(r1)
+	mtspr	SRR0,r2
+	mtspr	SRR1,r0
+	lwz	r0,GPR0(r1)
+	lwz	r2,GPR2(r1)
+	lwz	r1,GPR1(r1)
+	SYNC
+	rfi
+
+crit_return:
+	mfmsr	r28		/* Disable interrupts */
+	li	r4,0
+	ori	r4,r4,MSR_EE
+	andc	r28,r28,r4
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r28
+	SYNC
+	lwz	r2,_CTR(r1)
+	lwz	r0,_LINK(r1)
+	mtctr	r2
+	mtlr	r0
+	lwz	r2,_XER(r1)
+	lwz	r0,_CCR(r1)
+	mtspr	XER,r2
+	mtcrf	0xFF,r0
+	REST_10GPRS(3, r1)
+	REST_10GPRS(13, r1)
+	REST_8GPRS(23, r1)
+	REST_GPR(31, r1)
+	lwz	r2,_NIP(r1)	/* Restore environment */
+	lwz	r0,_MSR(r1)
+	mtspr	SPRN_CSRR0,r2
+	mtspr	SPRN_CSRR1,r0
+	lwz	r0,GPR0(r1)
+	lwz	r2,GPR2(r1)
+	lwz	r1,GPR1(r1)
+	SYNC
+	rfci
+
+mck_return:
+	mfmsr	r28		/* Disable interrupts */
+	li	r4,0
+	ori	r4,r4,MSR_EE
+	andc	r28,r28,r4
+	SYNC			/* Some chip revs need this... */
+	mtmsr	r28
+	SYNC
+	lwz	r2,_CTR(r1)
+	lwz	r0,_LINK(r1)
+	mtctr	r2
+	mtlr	r0
+	lwz	r2,_XER(r1)
+	lwz	r0,_CCR(r1)
+	mtspr	XER,r2
+	mtcrf	0xFF,r0
+	REST_10GPRS(3, r1)
+	REST_10GPRS(13, r1)
+	REST_8GPRS(23, r1)
+	REST_GPR(31, r1)
+	lwz	r2,_NIP(r1)	/* Restore environment */
+	lwz	r0,_MSR(r1)
+	mtspr	SPRN_MCSRR0,r2
+	mtspr	SPRN_MCSRR1,r0
+	lwz	r0,GPR0(r1)
+	lwz	r2,GPR2(r1)
+	lwz	r1,GPR1(r1)
+	SYNC
+	rfmci
+
+/*
+ * Cache functions.
+ */
+.globl invalidate_icache
+invalidate_icache:
+	mfspr	r0,L1CSR1
+	ori	r0,r0,L1CSR1_ICFI
+	msync
+	isync
+	mtspr	L1CSR1,r0
+	isync
+	blr
+
+.globl invalidate_dcache
+invalidate_dcache:
+	mfspr	r0,L1CSR0
+	ori	r0,r0,L1CSR0_DCFI
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+	blr
+
+	.globl	icache_enable
+icache_enable:
+	mflr	r8
+	bl	invalidate_icache
+	mtlr	r8
+	isync
+	mfspr	r4,L1CSR1
+	ori	r4,r4,0x0001
+	oris	r4,r4,0x0001
+	mtspr	L1CSR1,r4
+	isync
+	blr
+
+	.globl	icache_disable
+icache_disable:
+	mfspr	r0,L1CSR1
+	lis	r3,0
+	ori	r3,r3,L1CSR1_ICE
+	andc	r0,r0,r3
+	mtspr	L1CSR1,r0
+	isync
+	blr
+
+	.globl	icache_status
+icache_status:
+	mfspr	r3,L1CSR1
+	andi.	r3,r3,L1CSR1_ICE
+	blr
+
+	.globl	dcache_enable
+dcache_enable:
+	mflr	r8
+	bl	invalidate_dcache
+	mtlr	r8
+	isync
+	mfspr	r0,L1CSR0
+	ori	r0,r0,0x0001
+	oris	r0,r0,0x0001
+	msync
+	isync
+	mtspr	L1CSR0,r0
+	isync
+	blr
+
+	.globl	dcache_disable
+dcache_disable:
+	mfspr	r3,L1CSR0
+	lis	r4,0
+	ori	r4,r4,L1CSR0_DCE
+	andc	r3,r3,r4
+	mtspr	L1CSR0,r3
+	isync
+	blr
+
+	.globl	dcache_status
+dcache_status:
+	mfspr	r3,L1CSR0
+	andi.	r3,r3,L1CSR0_DCE
+	blr
+
+	.globl get_pir
+get_pir:
+	mfspr	r3,PIR
+	blr
+
+	.globl get_pvr
+get_pvr:
+	mfspr	r3,PVR
+	blr
+
+	.globl get_svr
+get_svr:
+	mfspr	r3,SVR
+	blr
+
+	.globl wr_tcr
+wr_tcr:
+	mtspr	TCR,r3
+	blr
+
+/*
+ * Function:	 in8
+ * Description:	 Input 8 bits
+ */
+	.globl	in8
+in8:
+	lbz	r3,0x0000(r3)
+	blr
+
+/*
+ * Function:	 out8
+ * Description:	 Output 8 bits
+ */
+	.globl	out8
+out8:
+	stb	r4,0x0000(r3)
+	sync
+	blr
+
+/*
+ * Function:	 out16
+ * Description:	 Output 16 bits
+ */
+	.globl	out16
+out16:
+	sth	r4,0x0000(r3)
+	sync
+	blr
+
+/*
+ * Function:	 out16r
+ * Description:	 Byte reverse and output 16 bits
+ */
+	.globl	out16r
+out16r:
+	sthbrx	r4,r0,r3
+	sync
+	blr
+
+/*
+ * Function:	 out32
+ * Description:	 Output 32 bits
+ */
+	.globl	out32
+out32:
+	stw	r4,0x0000(r3)
+	sync
+	blr
+
+/*
+ * Function:	 out32r
+ * Description:	 Byte reverse and output 32 bits
+ */
+	.globl	out32r
+out32r:
+	stwbrx	r4,r0,r3
+	sync
+	blr
+
+/*
+ * Function:	 in16
+ * Description:	 Input 16 bits
+ */
+	.globl	in16
+in16:
+	lhz	r3,0x0000(r3)
+	blr
+
+/*
+ * Function:	 in16r
+ * Description:	 Input 16 bits and byte reverse
+ */
+	.globl	in16r
+in16r:
+	lhbrx	r3,r0,r3
+	blr
+
+/*
+ * Function:	 in32
+ * Description:	 Input 32 bits
+ */
+	.globl	in32
+in32:
+	lwz	3,0x0000(3)
+	blr
+
+/*
+ * Function:	 in32r
+ * Description:	 Input 32 bits and byte reverse
+ */
+	.globl	in32r
+in32r:
+	lwbrx	r3,r0,r3
+	blr
+
+/*
+ * void e500_write_tlb(mas0, mas1, mas2, mas3, mas7)
+ */
+	.globl	e500_write_tlb
+e500_write_tlb:
+	mtspr	MAS0,r3
+	mtspr	MAS1,r4
+	mtspr	MAS2,r5
+	mtspr	MAS3,r6
+	li	r3,0
+	isync
+	tlbwe
+	msync
+	isync
+	blr
+
+/*
+ * void relocate_code (end of ram)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ * r3 = dest
+ * r4 = src
+ * r5 = length in bytes
+ * r6 = cachelinesize
+ */
+	.globl	relocate_code
+relocate_code:
+	mr	r9, r3			/* Save end of RAM 	*/
+
+	lis	r10, (_end - _start)@h	/* Size			*/
+	ori	r10, r10, (_end - _start)@l
+	sub	r3,  r3, r10
+
+	/* 64KB aligned */
+	lis	r10, 0xffff0000@h
+	ori	r10, r10, 0xffff0000@l
+	and	r3, r3, r10
+
+	mr	r1, r3		/* Set new stack just below barebox code */
+	mr	r10, r3 	/* Save copy of Destination Address */
+
+	bl 	calc_source
+calc_source:
+	mfspr	r4, LR	/* r4 = address in memory (flash, RAM) */
+	subi	r4, r4, (calc_source - _start)
+
+	GET_GOT
+	lis	r5, __init_size@h
+	ori	r5, r5, __init_size@l
+
+	li	r6,CACHELINE_SIZE
+
+	/*
+	 * Fix GOT pointer:
+	 *
+	 * New GOT-PTR = (old GOT-PTR - TEXT_BASE) + Destination Address
+	 *
+	 * Offset:
+	 */
+	sub	r15,r10,r4
+
+	/* First our own GOT */
+	add	r14,r14,r15
+	/* then the one used by the C code */
+	add	r30,r30,r15
+
+	/*
+	 * Now relocate code
+	 */
+
+	cmplw	cr1,r3,r4
+	addi	r0,r5,3
+	srwi.	r0,r0,2
+	beq	cr1,4f		/* In place copy is not necessary	*/
+	beq	7f		/* Protect against 0 count		*/
+	mtctr	r0
+	bge	cr1,2f
+
+	la	r8,-4(r4)
+	la	r7,-4(r3)
+1:	lwzu	r0,4(r8)
+	stwu	r0,4(r7)
+	bdnz	1b
+	b	4f
+
+2:	slwi	r0,r0,2
+	add	r8,r4,r0
+	add	r7,r3,r0
+3:	lwzu	r0,-4(r8)
+	stwu	r0,-4(r7)
+	bdnz	3b
+
+	/*
+	 * Now flush the cache: note that we must start from a cache aligned
+	 * address. Otherwise we might miss one cache line.
+	 */
+4:	cmpwi	r6,0
+	add	r5,r3,r5
+	beq	7f		/* Always flush prefetch queue in any case */
+	subi	r0,r6,1
+	andc	r3,r3,r0
+	mr	r4,r3
+5:	dcbst	0,r4
+	add	r4,r4,r6
+	cmplw	r4,r5
+	blt	5b
+	sync			/* Wait for all dcbst to complete on bus */
+	mr	r4,r3
+6:	icbi	0,r4
+	add	r4,r4,r6
+	cmplw	r4,r5
+	blt	6b
+7:	sync			/* Wait for all icbi to complete on bus */
+	isync
+
+	/*
+	 * Re-point the IVPR at RAM
+	 */
+	mtspr	IVPR,r10
+
+	/*
+ 	 * We are done. Do not return, instead branch to second part of board
+ 	 * initialization, now running from RAM.
+ 	 */
+
+	addi	r0,r10,in_ram - _start + _START_OFFSET
+	mtlr	r0
+	blr				/* NEVER RETURNS! */
+
+	.globl	in_ram
+in_ram:
+
+	/*
+	 * Relocation Function, r14 point to got2+0x8000
+	 *
+	 * Adjust got2 pointers, no need to check for 0, this code
+	 * already puts a few entries in the table.
+	 */
+	li	r0,__got2_entries@sectoff@l
+	la	r3,GOT(_GOT2_TABLE_)
+	lwz	r11,GOT(_GOT2_TABLE_)
+	mtctr	r0
+	sub	r11,r3,r11
+	addi	r3,r3,-4
+1:	lwzu	r0,4(r3)
+	cmpwi	r0,0
+	beq-	2f
+	add	r0,r0,r11
+	stw	r0,0(r3)
+2:	bdnz	1b
+
+	/*
+	 * Now adjust the fixups and the pointers to the fixups
+	 * in case we need to move ourselves again.
+	 */
+	li	r0,__fixup_entries@sectoff@l
+	lwz	r3,GOT(_FIXUP_TABLE_)
+	cmpwi	r0,0
+	mtctr	r0
+	addi	r3,r3,-4
+	beq	4f
+3:	lwzu	r4,4(r3)
+	lwzux	r0,r4,r11
+	cmpwi	r0,0
+	add	r0,r0,r11
+	stw	r4,0(r3)
+	beq-	5f
+	stw	r0,0(r4)
+5:	bdnz	3b
+4:
+clear_bss:
+	/*
+	 * Now clear BSS segment
+	 */
+	lwz	r3,GOT(__bss_start)
+	lwz	r4,GOT(_end)
+
+	cmplw	0,r3,r4
+	beq	6f
+
+	li	r0,0
+5:
+	stw	r0,0(r3)
+	addi	r3,r3,4
+	cmplw	0,r3,r4
+	bne	5b
+6:
+	mr 	r3, r10		/* Destination Address      */
+	bl 	board_init_r
+
+	/*
+	 * Copy exception vector code to low memory
+	 *
+	 * r3: dest_addr
+	 * r7: source address, r8: end address, r9: target address
+	 */
+	.globl	trap_init
+trap_init:
+	mflr	r4			/* save link register		*/
+	GET_GOT
+	lwz	r7,GOT(_start_of_vectors)
+	lwz	r8,GOT(_end_of_vectors)
+
+	li	r9,0x100		/* reset vector always at 0x100 */
+
+	cmplw	0,r7,r8
+	bgelr				/* return if r7>=r8 - just in case */
+1:
+	lwz	r0,0(r7)
+	stw	r0,0(r9)
+	addi	r7,r7,4
+	addi	r9,r9,4
+	cmplw	0,r7,r8
+	bne	1b
+
+	/*
+	 * relocate `hdlr' and `int_return' entries
+	 */
+	li	r7,.L_CriticalInput - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_MachineCheck - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_DataStorage - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_InstStorage - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_Alignment - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_ProgramCheck - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_FPUnavailable - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_Decrementer - _start + _START_OFFSET
+	bl	trap_reloc
+	li	r7,.L_IntervalTimer - _start + _START_OFFSET
+	li	r8,_end_of_vectors - _start + _START_OFFSET
+2:
+	bl	trap_reloc
+	addi	r7,r7,0x100		/* next exception vector	*/
+	cmplw	0,r7,r8
+	blt	2b
+
+	lis	r7,0x0
+	mtspr	IVPR,r7
+
+	mtlr	r4			/* restore link register	*/
+	blr
+
+
+.globl _text_base
+_text_base:
+	.long TEXT_BASE
+
+.globl unlock_ram_in_cache
+unlock_ram_in_cache:
+	/* invalidate the INIT_RAM section */
+	lis	r3,(CFG_INIT_RAM_ADDR & ~(CACHELINE_SIZE-1))@h
+	ori	r3,r3,(CFG_INIT_RAM_ADDR & ~(CACHELINE_SIZE-1))@l
+	mfspr	r4,L1CFG0
+	andi.	r4,r4,0x1ff
+	slwi	r4,r4,(10 - 1 - L1_CACHE_SHIFT)
+	mtctr	r4
+1:	dcbi	r0,r3
+	addi	r3,r3,CACHELINE_SIZE
+	bdnz	1b
+	sync
+
+	/* Invalidate the TLB entries for the cache */
+	lis	r3,CFG_INIT_RAM_ADDR@h
+	ori	r3,r3,CFG_INIT_RAM_ADDR@l
+	tlbivax	0,r3
+	addi	r3,r3,0x1000
+	tlbivax	0,r3
+	addi	r3,r3,0x1000
+	tlbivax	0,r3
+	addi	r3,r3,0x1000
+	tlbivax	0,r3
+	isync
+	blr
+
+.globl flush_dcache
+flush_dcache:
+	mfspr	r3,SPRN_L1CFG0
+
+	rlwinm	r5,r3,9,3	/* Extract cache block size */
+	twlgti	r5,1		/* Only 32 and 64 byte cache blocks
+				 * are currently defined.
+				 */
+	li	r4,32
+	subfic	r6,r5,2		/* r6 = log2(1KiB / cache block size) -
+				 *      log2(number of ways)
+				 */
+	slw	r5,r4,r5	/* r5 = cache block size */
+
+	rlwinm	r7,r3,0,0xff	/* Extract number of KiB in the cache */
+	mulli	r7,r7,13	/* An 8-way cache will require 13
+				 * loads per set.
+				 */
+	slw	r7,r7,r6
+
+	/* save off HID0 and set DCFA */
+	mfspr	r8,SPRN_HID0
+	ori	r9,r8,HID0_DCFA@l
+	mtspr	SPRN_HID0,r9
+	isync
+
+	lis	r4,0
+	mtctr	r7
+
+1:	lwz	r3,0(r4)	/* Load... */
+	add	r4,r4,r5
+	bdnz	1b
+
+	msync
+	lis	r4,0
+	mtctr	r7
+
+1:	dcbf	0,r4		/* ...and flush. */
+	add	r4,r4,r5
+	bdnz	1b
+
+	/* restore HID0 */
+	mtspr	SPRN_HID0,r8
+	isync
+
+	blr
+
+.globl setup_ivors
+setup_ivors:
+
+#include "fixed_ivor.S"
+	blr
diff --git a/arch/ppc/include/asm/cache.h b/arch/ppc/include/asm/cache.h
index 4f7ca86881..147ceb6714 100644
--- a/arch/ppc/include/asm/cache.h
+++ b/arch/ppc/include/asm/cache.h
@@ -31,6 +31,8 @@
 extern void flush_dcache_range(unsigned long start, unsigned long stop);
 extern void clean_dcache_range(unsigned long start, unsigned long stop);
 extern void invalidate_dcache_range(unsigned long start, unsigned long stop);
+extern void flush_dcache(void);
+extern void invalidate_icache(void);
 #ifdef CFG_INIT_RAM_LOCK
 extern void unlock_ram_in_cache(void);
 #endif /* CFG_INIT_RAM_LOCK */